Network injection and capture
Packit (Packet toolkit) is a network auditing tool. Its value is derived
from its ability to customize, inject, monitor, and manipulate IP traffic.
By allowing you to define (spoof) nearly all TCP, UDP, ICMP, IP, ARP,
RARP, and Ethernet header options, Packit can be useful in testing
firewalls, intrusion detection/prevention systems, port scanning,
simulating network traffic, and general TCP/IP auditing. Packit is also
an excellent tool for learning TCP/IP.